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參數(shù)資料
| 型號(hào)： | FAN5607 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | LED Driver with Adaptive Charge Pump DC/DC Converter |
| 中文描述： | LED驅(qū)動(dòng)器自適應(yīng)電荷泵DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 546K |
| 代理商： | FAN5607 |
10
REV. 1.0.0 6/22/04
FAN5607
PRODUCT SPECIFICATION
PWM Control
Unless otherwise noted,
R
SET
= 12.5K
, I
LED_MAX
= 20mA
Enable is Controlled by PWM Signal
1KHz
1KHz
s
D 30%
D 70%
ENABLE Input (PWM)
s
I
LED
(Average)
= 0.7 x I
LED-MAX
I
LED
(Average)
= 0.3 x I
LED-MAX
OFF
ILED
0mA
PWM Control
Once R
SET
is chosen to set maximum LED current
(I
LED_MAX
), PWM modes can be used for brightness con-
trol. By turning the ENABLE pin ON and OFF, the current
can be modulated between 0 to I
LED_MAX
to achieve any
I
Average
value. In PWM mode, the modulating frequency has
to be set sufficiently high in order to avoid a flickering effect
(50Hz to 100Hz).
The best LED to LED matching and the purest white light
are achieved over the entire range of average current settings,
when the PWM brightness control is used to modulate the
LED current between zero and the maximum value.
Application Information
Brightness Control
1. Dimming Using PWM at EN Pin
A PWM signal applied to EN can control the LED brightness
in direct dependence on the duty cycle. The recommended
PWM signal frequency is 100Hz to ensure a good match
between the input signal duty cycle and the LED average
current. If this ripple frequency is too low for a particular
noise sensitive application, then DC-based dimming control
circuits or higher-frequency-filtered PWM signals may be
used.
2. Dimming with DC Voltage
The brightness control using a variable DC voltage is shown
in Figure 5. If R1=125k
, R2=13.9k
, adjusting V
EXT
in the
(0V to 0.5V) range results in dimming the LED current from
20mA to 2mA.
The FAN5607 internal circuit maintains a constant I
SET
volt-
age = 0.5V. Adjusting V
EXT
changes the I
SET
and I
LED
accordingly.
Selecting different values for R1, R2 and V
EXT
range, the
I
LED
variation range can be changed according to the rela-
tion:
mA
Where 0V < V
EXT
< 0.5V and R1 and R2 are in K
.
3. Dimming Using a Filtered PWM Signal
The external PWM signal is filtered by an R3C network
resulting in a DC component dependent on the PWM signal
duty cycle as shown in Figure 6. The resistor R3 needs to be
much smaller than R2 and the corner frequency of R3C
group is much smaller than the PWM signal frequency.
V
EXT
I
SET
FAN5607
R2
R1
Figure 5. DC Voltage Control
I
LED
R1
250
--------------------R2
500
V
EXT
×
–
(
)
+
=
I
SET
FAN5607
R2
R3
R1
C
Figure 6. Filtered PWM Control
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PDF描述 |
|---|---|
| FAN5607HMPX | LED Driver with Adaptive Charge Pump DC/DC Converter |
| FAN5608DMPX | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608MPX | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608 | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608DHMPX | Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5607_AEA3026B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5607HMPX | 功能描述:LED照明驅(qū)動(dòng)器 LED Driver w/ Adap Charge Pump DC/DC RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| FAN5608 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608_06 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter |
| FAN5608DHMPX | 功能描述:LED照明驅(qū)動(dòng)器 LED Driver Serial/Parallel RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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